Labor not predicting citizenship outcome

It's a mug's game trying to predict if the High Court will allow Labor Senator Katy Gallagher to remain in parliament, or if she will be the latest victim of the citizenship saga, one of her colleagues says.

The High Court will on Wednesday hand down its decision on a case which could have wider implications for a swag of lower house MPs, and the numbers on the floor of federal parliament.

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Lawyers for Senator Gallagher, who represents the ACT, argue she took every action to sever her citizenship by descent through her father, and it was "incredibly uncertain" how long a person should wait for British officials to approve the decision.

Three Labor lower house MPs - Justine Keay, Josh Wilson and Susan Lamb - are in similar dual citizenship situations.

Senior government figures have said if Senator Gallagher is disqualified they too should stand down.